A disadvantage of shape memory polymers in comparison to shape memory alloys is the much lower stiffness which leads to a relatively small recovery force under constraint. However, when incorporated into a fiberglass-reinforced composite, the stiffness and, hence, the recovery force of the shape mem...
Definition Shape memory material is a material that after being deformed to a temporary shape can recover a permanent shape. There are shape memory alloys (SMA) and shape memory polymers (SMP) that exhibit this behavior with high rigidity and large shape recovery. Shape memory composite (SMC) ...
Shape-Shifters.Discusses potential uses for shape-memory polymers (SMPs). Definition of a SMP, which is a special plastic that can be deformed and then be restored to its original shape by applying heat; Development of SMPs that can respond to other environmental changes; Potential use of ...
Here we report such an approach to predict the shape fixity and free recovery of thermo-rheologically simple shape memory polymers. The results show that the influence of programming conditions to free recovery can be unified by a reduced programming time that uniquely determines shape fixity, ...
The shape memory polymers that show a thermally induced shape-memory effect are network structure. The netpoints, which can have either a chemical or physical nature, determine the permanent shape. The net chain shows a thermal transition in the temperature range which the shape-memory effect is...
tuning the dimensions of the optical devices by shape memory polymers (SMPs) is of interest due to their relatively short response times (seconds to minutes depending on actuation temperature33). Distinct from the pattering of SMPs through nanoimprinting34,35,36and self-assembly37,38,39, our us...
To address these issues, we here introduce a novel, maggot-inspired, magnetically driven “mag-bot” that utilizes shape memory alloy-induced, thermoresponsive actuation and surface pattern-induced anisotropic friction to achieve locomotion inspired by fly larvae. This simple, untethered design can ...
Fundamentals on the definition of various types of stress and strain, and multiplicative decomposition of deformation gradient, are briefly discussed, which provides the required knowledge and framework for understanding the constitutive modeling of shape memory polymers used in this book. Two popular ...
The history of shape-memory polymers goes back to 1940s [173]. However, the importance of SMPs is recognized in the 1960s when self-shrinkable tubes and films are made using cross-linked polyethylene [174]. Remarkable attention is paid to SMPs in the 1980s and growing today with the numbe...
3.4Shape-Memory Alloys and Shape-Memory Polymers A shape-memory alloy (SMA, smart metal, memory metal, memory alloy, muscle wire, and smart alloy) is an alloy that “remembers” its original, cold-forged shape by returning to that pre-deformed shape when heated. This material is an extremel...